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# Perimeter, Circumference, Area, Surface Area, Volume

Levels are CK-12's student achievement levels.
Basic Students matched to this level have a partial mastery of prerequisite knowledge and skills fundamental for proficient work.
At Grade (Proficient) Students matched to this level have demonstrated competency over challenging subject matter, including subject matter knowledge, application of such knowledge to real-world situations, and analytical skills appropriate to subject matter.
Advanced Students matched to this level are ready for material that requires superior performance and mastery.
• Interactive Exercise

## Find the Perimeter of this Polygon

by CK-12 //at grade

A polygon and a side length is given. Determine the perimeter.

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• Interactive Exercise

## Perimeter of Equilateral Triangle ABC

by CK-12 //at grade

Presents details about the side lengths of an equilateral triangle and asks the perimeter.

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• Interactive Exercise

## What is Perimeter?

by CK-12 //at grade

Checks your understanding of what perimeter means.

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• Interactive Exercise

## What is Area?

by CK-12 //at grade

Checks your understanding of what area means.

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• Interactive Exercise

## Side Length of Equilateral Triangle ABC

by CK-12 //at grade

Presents details about the side lengths of an equilateral triangle and asks the perimeter.

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